A lectin from the Chinese bird-hunting spider binds sialic acids |
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Authors: | Hans-Christian Siebert Shan-Yun Lu Rainer Wechselberger Karin Born Thomas Eckert Songping Liang Claus-Wilhelm von der Lieth Jesús Jimnez-Barbero Roland Schauer Johannes FG Vliegenthart Thomas Lütteke Tibor Kor |
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Institution: | Hans-Christian Siebert, Shan-Yun Lu, Rainer Wechselberger, Karin Born, Thomas Eckert, Songping Liang, Claus-Wilhelm von der Lieth, Jesús Jiménez-Barbero, Roland Schauer, Johannes F.G. Vliegenthart, Thomas Lütteke,Tibor Ko?ár, |
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Abstract: | The affinity to sialic acid-containing oligosaccharides of the small-animal lectin SHL-I isolated from the venom of the Chinese bird-hunting spider Selenocosmia huwena is here described for the first time. By a strategic combination of NMR techniques, molecular modeling, and data mining tools it was possible to identify the crucial amino acid residues that are responsible for SHL-I’s ability to bind sialic acid residues in a specific way. Furthermore, we are able to discuss the role of the functional groups of sialic acid when bound to SHL-I. Also the impact of Pro31 in its cis- or trans-form on SHL-I’s ligand affinity is of special interest, since it answers the question if Trp32 is a crucial amino acid for stabilizing complexes between SHL-I and sialic acid. SHL-I can be considered as a proper model system that provides further insights into the binding mechanisms of small-animal lectins to sialic acid on a sub-molecular level. |
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Keywords: | Sialic acid Lectin Carbohydrate– protein interaction Molecular modeling NMR analysis |
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